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我省自1968年开始改用地鼠肾细胞所培养的灭活疫苗(下称淡苗),乙脑发病率明显下降。1981年起试用其浓制剂(下称浓苗),注射剂量仅为淡苗的20％,经3年观察,在其他乙脑预防措施无明显改变的情况下,发现有些地区乙脑发病率有回升趋势。因此,必须重新考核浓苗的免疫效果,我们在1983年浓苗预防接种工作中,有计划地对接种对象进行了血清学效果观察,现报告如下。
Since 1968, our province has switched to the inactivated vaccine of hamster kidney cells (hereinafter referred to as the light seedlings), and the incidence of Japanese encephalitis decreased significantly. Since 1981, its concentrated preparation (hereinafter referred to as thick seedlings) was injected at a dose of only 20% of the light seedlings. After 3 years of observation, no significant changes were observed in other preventive measures for Japanese encephalitis. In some areas, the incidence of Japanese encephalitis Rebound trend. Therefore, we must re-assess the effect of heavy seedlings of immunization, vaccination in the thick seedlings in 1983, we conducted a planned serological observation of vaccination subjects, are as follows.